In the Deep Blue Socialist Peoples Republic of Md i have not seen any Biden signs of any kind. I did see a pickup with a Trump Flag and an older Gentleman with a Trump/Pence Sticker on his hat.
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Two points: (1) in 2016 17 of Maryland’s 23 counties voted for DJT. Unfortunately the state is plagued by an army of flaming liberals in Baltimore, the State House, and in the counties surrounding D.C. And (2) if you want to see Trump support in Maryland come to the mountains where you will see many hundreds of flags and signs all over Allegany and Garrett Counties, but almost NO signs for Plugs. And I suspect the same is true on the Eastern Shore, although I’ve not been over there recently to verify that.
Deep blue Baltimore, Prince Georges, and Montgomery Counties dominate the political landscape in MD. Howard and Charles Counties have also gone blue.